Functional safety
13.4 Fundamental safety technology principles
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
711
13.4
Fundamental safety technology principles
13.4.1
Standard stop functions
13.4.1.1
Emergency Off and Emergency Stop
"Emergency Off" and "Emergency Stop" are commands that minimize different risks in the
machine or plant.
The STO function is suitable for achieving an Emergency Stop but not an Emergency Off.
You can review the details about the definitions in EN 60204-1.
Risk:
Risk of electric shock:
Risk of unexpected motion:
Measure to
minimize risk:
Safe switch off
Switching off the electric power
supply for the installation, either
completely or partially.
Safely stop and safely prevent
restarting
Stopping or preventing the dangerous
movement
Command:
Emergency Off
Emergency Stop
Solution:
Switch off the power supply:
Select STO:
It is permissible that you switch off
the inverter power supply as well.
However, switching off the voltage is
not required as a risk-reduction
measure: